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A material standpoint -
from what I've seen most sex toys are made of rubbers, jellys, and similar compounds. These are porous on a microscopic level and *will* retain bacteria, dirt, dust, and other small particles. They will also degrade over time. Silicon is much more durable and can be sterilized, though if it comes in to contact with silicon lubes or other silicon products, it can bond(melt) with them.
Glass can easily be sterilized and formed into lots of different shapes. I would definitely want a glass toy to be made of more durable glass such as Pyrex or borite silicate(or are they the same? Materials class was a long, long time ago so I might be wrong on that second name) as those compounds are much, much more durable when it comes to impacts as well as temperature change such as boiling to sterilize then putting it in cold water that would shatter normal glass.
Sexual functionality -
It will provide stimulation *exactly* where you intend to receive it. Whether you flex or shift inside, it's still going to move where you move it and in the way you want because it has zero bend or compression to it. Also, the human body perceives temperature change rates, not the actual temperature. This is why a metal toilet seat feels colder than a plastic or wooden one, even though they're probably at the same temperature. Glass will conduct heat much, much more quickly than the other materials I've listed, so if you keep a bowl of warm or cold water by the bed, you can plunge it in and really notice the temperature inside. While my gf and I both thought we would hate playing with cold temperatures since cold massage oil really turned us off, we were proven wrong by accident. After we'd each orgasmed a few times and were taking a brief break to get some water, she went down on me after having drank the ice water and it was amazing, so I did the same and returned the favor. Apparently we just needed to be sufficiently aroused before any temperature play and our bodies would respond in a very, very good way.
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